Seat support for revolving chairs

ABSTRACT

The invention concerns a seat support for revolving chairs, in particular office revolving chairs, comprising a metal body in the shape of a pan, provided with top fixing elements for the seat lower part or seat plate, a bottom part for receiving the conical end of a support post adjustable in height, rear assembling elements for assembling said support to a seat back support and at least a lateral or front sleeve, provided for at least an actuating lever. The pan-shaped metal body has side walls opening obliquely frontwards at least partially into an angle ranging between 20 and 70 relative to the seat support longitudinal median axis, and are joined therein with a front wall. The pan-shaped metal body horizontal transverse section, formed by the side walls and the front wall tapers towards the tub base.

The invention pertains to a seat holder with the characteristics of thegeneral concept of claim 1.

Such seat holders for swivel chairs, especially office swivel chairs,consisting of a tub-shaped metal piece with attachment provisions on topfor the underside of a seat or a seat plate, a lower receptacle for theconical end of a support column of adjustable height, rear connectionsfor connecting to a holder for a backrest, and at least one side orfront passage for at least one operating lever, are known for examplefrom DE-C-34 24 756. This seat holder, which is T-shaped in the topview, has a welded-on conical socket and a welded-on holding element andrequires relatively heavy-gauge sheet metal.

The task of the present invention is to create a seat holder of the typenamed at the beginning, in which sheet metal of the lightest possiblegauge can be used, in which welded seams are kept to a minimum and whoseassembly is as simple as possible.

This task is solved with the features named in the characterizing partof claim 1. Refinements and advantageous versions of the invention areincluded in the additional claims.

According to the invention, the tub-shaped metal piece of a seat holderof this type has side walls which are at least partially open obliquelyat an angle of between 20° and 70° to the longitudinal center axis ofthe seat holder toward the front; there they join a front wall, and thehorizontal cross section of the tub-shaped metal piece formed by theside walls and the front wall decreases in size toward the bottom of thetub. This design makes it possible to dispense with the welded-onholding element of DE-C-34 24 756, and in addition to achieve highstrength by means of creases and edges or rounding in the sheet metal,which allows the thickness of the sheet metal to be reduced.

The receptacle for the conical end of the support column is a conicalsocket of known type, which is connected to the bottom of the tub at itslower end and which is advantageously held in a higher area by ahorizontal reinforcement sheet, with the reinforcement sheet braced inor on the side walls and/or the front wall. It is advantageous for thereinforcing sheet to be clamped to the conical socket, and thereinforcing sheet is clamped, creased, stamped or riveted into the sidewalls and/or the front wall by means of slits, straps and/or bends.

The connecting elements for the connection with the backrest holderconsist in known manner of at least two lateral holes to receive ahorizontally positioned transverse pin; the holes can be executed with adeep-drawn reinforcing rim. The attachment provisions for the seat plateor seat consist of at least three horizontally bored holes inprojections or tabs of the metal piece.

With the designated design it is possible to produce the tub-shapedmetal piece with the attachment or connecting provisions in a singlepiece.

The holes for the connection with the backrest holder can bestrengthened by an insert or the like; preferably this insert is areinforcement piece with U-shaped cross section inserted transverselybetween the side walls, whose sides overlap the holes and have holeswhich are concentric to them.

In the following section the invention will be described in greaterdetail by way of examples on the basis of drawings. The illustrationsshow the following:

FIG. 1 a side view of a seat holder.

FIG. 2 a top view of FIG. 1.

FIG. 3 is a side view of a seat holder.

FIG. 4 is a cross-section view of the seat holder of FIG. 3 taken alongline IV—IV.

The seat holder 1 in accordance with FIGS. 1 and 2 consists of atub-shaped metal piece 2 with two side walls 2′ which, after a shortparallel rear portion, spread outward toward the front at identicalangles, and a front wall 2″ which connects the latter, so that in thetop view the resulting impression is largely that of a triangle. Towardthe bottom the side walls 2′ and the front wall 2″ approach each otherobliquely and unite in a horizontal tub floor 2′′′. The tub floor 2′′′has a round opening, into which is inserted a conical socket 3 forreceiving a support column, with a flange 4 which makes flat contactunder the floor. To stabilize the conical socket 3 there is a horizontalreinforcement sheet 7 inserted between the side walls 2′ and the frontwall 2″ by means of welded seams; this sheet has a round opening for theupper end of the conical socket 3, and holds the latter clamped in acircumferential flange 9 which is directed upward. To activate a releasefor a gas spring on the support column, a lever 5 is guided outwardthrough a hole 6 in the front wall 2″ of the tub-shaped metal piece 2;the lever can rotate in the metal piece, and has a protrusion which canpress on the release. For the connection with a seat plate thetub-shaped metal piece 2 has side or front horizontally directed tabs2″″ with attachment holes 12. For the connection to a backrest holder 11which is swivel-mounted on the parallel rear portion of the seat holder,there are holes 10 in the sidewalls 2″, which are aligned coaxially withcorresponding holes in the backrest holder and receive a pin or thelike.

What is claimed is:
 1. Seat holder for swivel chairs, consisting of atub-shaped metal piece with attachment provisions on top for theunderside of a seat or a seat plate, an adjustable-height support columnhaving a conical end, a lower receptacle for the conical end of theadjustable-height support column, rear connectors for the connection toa back rest holder, and at least one opening in at least one of the sideor front of the tub-shaped metal piece for at least one operating lever,the tub-shaped metal piece (2) having sidewalls (2′) which open at leastpartially obliquely at an angle to a longitudinal center axis of theseat older (1) of between 20° and 70° toward a front end of the seatholder, where they join a front wall (2″), and that each of the sidewalls (2′) and the front wall (2″) taper toward a floor of the tub(2′″).
 2. Seat holder as in claim 1, characterized by the fact that thereceptacle for the conical end of the support column is a conical socket(3) which is connected at its lower end with floor of the tub (2′″) andin a higher area is held by a reinforcing sheet (7), with thereinforcing sheet braced in or on at least one of the side walls (2′)and the front wall (2″).
 3. Seat holder as in claim 2, characterized bythe fact that the reinforcing sheet (7) is clamped onto the conicalsocket (3).
 4. Seat holder as in claim 2, characterized by the fact thatthe reinforcing sheet (7) is one of clamped, creased, stamped andriveted into one of the sidewalls and the front wall by means of atleast one of slits, straps and bends.
 5. Seat holder as in claim 1,characterized by the fact that connection provisions for the connectionwith the backrest holder (11) consist of at least twohorizontally-drilled holes (10) for receiving a horizontally positionedcross-pin.
 6. Seat holder as in claim 5, characterized by the fact thatthe holes are reinforced by means of an insert.
 7. Seat holder as inclaim 5, characterized by the fact that the insert is a reinforcementpiece with a U-shaped cross section inserted transversely between theside walls, whose sides overlap the holes and have reinforcement pieceholes which are concentric to the holes.
 8. Seat holder as in claim 5,characterized by the fact that the holes are formed with a deep-drawnreinforcement rim.
 9. Seat holder as in claim 1, characterized by thefact that the attachment provisions for the seat plate or the seatconsist of at least two horizontally drilled holes (12) in tabs (2″″) ofthe metal piece.
 10. Seat holder as in claim 1, characterized by thefact that the tub-shaped metal piece is produced in a single piece withthe attachment provisions.